Answer: Related: Zebras, Donkeys, Mules, Pony, and Hinny.
Explanation:
Horses are apart of the equidae family. Mules are a mix of a male donkey and a female horse and a hinny is a mix of a female donkey and a male horse.
For animals that aren't related, that could be anything.
Fish, whale, shark, monkey, hedgehog, etc.
